Asking 'how much treasure is missing' is assuming that indeed, treasure is missing. More correct would be to ask "Is treasure missing from the Heroic/Paragon/Epic official 4E modules?"
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Adriano Varoli PiazzaNov 14 '10 at 14:26

If the players gather all the treasure in all 25 encounters of Keep on the Shadowfell, they gain the following:

12 magic items

1x level 1

2x level 2

3x level 3

2x level 4

3x level 5

1x level 6

4408 gold pieces worth of cash, gems, jewelry, etc.

3 healing potions

So it looks like the magic items awarded are slightly less powerful than the treasure parcels suggest, but the monetary value is roughly 30% higher. Some of this is hidden or in locked chests, but nobody said that treasure hunting would be easy.